Thousands of CIBC and Bank of Montreal customers have been issued new credit cards from their banks along with warnings their old cards may have been used fraudulently, CBC News has learned.

Well, at least they're coming clean about the mistake...

The banks wouldn't say how many customers have been affected, what the security breach was or whether any credit cards have actually been misused. They also wouldn't disclose why they have reissued cards when other banks have not.